Means for and methods of producing preassembled nuts and washers



July 7,

Filed Oct. 19, 1949 M. H. NIELSEN MEANS FOR AND METHODS OF PRODUCING PREASSEMBLED NUTS AND WASHERS 14 Sheet's-Shet 1 INVENTOR.

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July 7, 1953 M. H. NIELSEN 2,644,178

MEANS FOR AND METHODS OF PRODUCING PREASSEMBLED NUTS AND WASHERS Filed Oct. 19, 1949 14 Sheets-Sheet 5 INVENTOR.

July 7, 1953 M. H. NIELSEN 2,644,178

MEANS FOR AND METHODS OF PRODUCING PREASSEMBLED NUTS AND WASHERS Filed Oct. 19, 1949 14 Sheets-Sheet 6 IN VEN TOR.

July 7, 1953 M. H. NIELSEN 2,644,178

MEANS FOR AND METHODS OF PRODUCING PREASSEMBLED NUTS AND WASHERS Filed Oct. 19, 1949 14 Sheets-Sheet '7 IN V EN TOR.

M. H. NlELsEN MEANS FOR AND METHODS OF PRODUCING July 7, 1953 PREASSEMBLED NUTS AND WASHERS 14 Sheets-Sheet 8 Filed Oct. 19, 1949 yang-z Ma g2 mm am/rzg EVFQ M. H. NIELSEN MEANS FOR AND METHOD July 7; 1953 s 0F paonucmc PREASSEMBLED NUTS AND WASHERS 14--Sheets-Sheet -9 Filed Oct. 19, 41949 N MN M %w j M NW 'INVENTOR; I mz zi/wem y 7, 3 'M. H. NIELSEN 2,644,178 MEANS FOR AND METHODS OF PRODUCING PREASSEMBLED NUTS AND WASHERS 14 Sheets-Sheet 10 Filed Oct. 19, 1949 I v INVENTOR. .Jl/orziz July 7, 1953- M. H. NIELSEN 2,644,178

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PREASSEMBLED NUTS WASHERS S OF AND r I 14 Sheets-Sheet 11 Filed Oct. 19, 1949 July 7, 1953 v NIELSEN 2,644,178

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MEANS FOR AND METHODS OF PRODUCING PREASSEMBLED NUTS AND WASHERS 14 Sheets-Sheet 13 Filed Oct. 19, 1949 IIIIlIIIIlI/l & WA

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' MEANS FOR A METHODS OF PRODUCING PREASSEMB D NUTS AND WASHERS Filed 0a.. 19, 1949 14 sheets-sheet 14 Patented July 7, 1953 MEANS FOR AND METHODS OFPRODUCING PREASSEMBLED NUTS AND WASHERS Moritz H. Nielsen, Chicago, 111., assign'or 61mnois Tool Works, Chicago, 111., a corporation of Illinois Application October 19, 1949, Serial No. 122,178

29 Claims.

This invention relates to a method and machine for manufacturing assembled nut and washer units.

The present invention consists in a machine andmethod by which multiple operations are performed upon suitable rod or bar stock to form nut blanks having. washer receiving sections to telescope assembled washers, specifically, toothed lock washers, with the washer receiving sections of the partially formed nuts or nut blanks, and thereafter to thread the nut blanks.

It is an object of this invention to provide a method and a machine for manufacturing assembled nut and washer units.

It isa further object of the invention to provide a method and machine for assembling washers with nut blanks during the process. of manufacture of the nuts.

It has heretoforebeen proposed to provide assembled nut and washer units by forcing radially resilient split ring washers over the preformed skirts of completed nuts, but these have not been entirely satisfactory. The skirts of the nuts interfere with the proper locking action of the .split ring washers; each split ring washer is frictionally held against rotation relative to the skirt of the nut, and tends to mar or fracture the work piece, and there is an unsatisfactorily high percentage of loss of washers from the units because of the impositive nature of their secure- .ment against axial movement with respect to the nuts. It is, accordingly, an important object of this invention to provide a method and means for assembling continuous ring, preferably toothed, lock washers with nuts or nut blanks in such manner that the washers may be rotated freely relative to the nuts, and yet be held positively against dislodgement therefrom.

An ancillary object of the invention is to provide attachments for a nut making machine, by means of which said machine is converted into a machine for making nut and washer assembly units.

Other and further objects of the invention are to provide means for assembling washers with drilled but unthreaded nut blanks; to provide means for feeding a strip of washers to washer severing and assembling mechanisms by means of which the washers are assembled with nut blanks in the process of manufacturing nuts; to provide an assembly mechanism which not only telescopes a nut or nut blank with the washer, but at the same time causes interlocking of the washer with the nut so that permanently assembled units of nuts and washers are provided by this assembly mechanism; to provide an attachment or attachments for a standard or well known automatic screw machine, whereby said machine. can be readily converted into a machine, forv ,manufacturing assembled nut and washer units;. and to provide a machine for automatically feeding partially formed skirted nut blanks to an assembly mechanism while said blanks are still attach'ed to the nut stock, the ,assembly mechanism telescoping washers with the skirts of 'thei'nut blanks and upsetting, swaging or enlarging the skirts of the. nut blanks beneath the washers, or in the plane of the washers, permanently to hold the nuts and washers in assembled relation, and thereafter automatically threading or tapping the nut blanks and severing the same from the stock.

' Other and further objects and advantages of the invention will beapparentwhen taken in connection with the drawings, wherein:

Fig. 1 is a front view in vertical elevation of a machine embodying the invention;

Fig. 2 is a fragmentary view taken in section-along the line 2-2 of Fig. l; i

Fig. 3 is a fragmentary view in vertical section, taken alongv the line 3-3 of Fig.-- 2; i

Fig. 4 is a fragmentary view in elevation and partly. in section, taken substantially along the line 44 of Fig.1;

Fig. 5 is a fragmentary view in vertical section, taken substantially along the line 5-5 of Fig. 6;

Fig. 6 is a fragmentary view in vertical section, taken substantially along the line 6-6 of Fig. 4;

Fig. 7 is a view in vertical section, taken substantially along the line 1-1 of Fig. 1; v

Fig. 8 is a view in section, taken substantially along the line 8-8 of Fig. 1;

Fig. 9is a fragmentary view in horizontal section, taken substantially along the line 9-9 .of

Fig. 6;

Fig. 10 is a fragmentary view in perspective of the nut tapping device; p l Fig. 11 is a fragmentary view in vertical section, taken along the line H-ll of Fig. 6;

Figs. '12, 12A, 12B, l2C,l2D, and 12E are diagrammatic views illustrating the drivingmechanism of the machine;

Fig. 13 is-a fragmentary View in vertical section, taken along the line I3-l3 of Fig. 9;

Fig. 14 is a view similar to Fig. 13, but with the parts in a different position of operation;

Fig. 15 is a, fragmentary view in horizontal section, taken substantially along the line l5-l5 ofFig.l3;.

Fig; 16 is a fragmentary view in elevation,

- control taken substantially along the line l6l6 in Fig. 9;

Fig. 17 is a fragmentary view in vertical section, taken along the line ll--I1 of Fig. 16;

Fig. 18 is a fragmentary view in horizontal section, taken substantially along the line |8|8 of Fig. 16;

Fig. 19 is a fragmentary view .in elevation, looking along the line l9l9 of Fig. 1'7;

Fig. 20 is a view similar to Fig. 19, but with the parts in a difierent position of operation;

Fig. 21 is a view in horizontal section,=-taken along the line 2l2l of Fig. 26;

Figs. 22 and 23 are views'similar-to .Fig. :21,

but with the parts in differentpositions of .oper-- ation;

Fig. 24 is a fragmentaryenlarged view showing the connection between washers ofthewasher strip;

Fig. 25 is a fragmentary view in section, taken substantially. along .the.,line.,2 5..-Z5 of.F.',ig.,24;;-

IFig..2'6 is .a fragmentary .view .in verticalsection, takenalongthe line iii-2610f .Fig. 14;

Fig. 27 .is a viewsimilanto Fig. .26, bnt-.w ith the parts in a different position .of .operation;

'1Fig."28 ,is ,a 'fra gmentary view in horizontal section, taken substantiallyaalong the .line 28-28 of Fig. '26; a

"Fig... 29 is a fragmentary view (of .a portionof .Fig. 28, butwith the partsfiniawffierentposition of operation;

' "Fig..'30 is affragmentary view .in vertical .section, taken substantially .along the;line, 3 0-.;3l! ..of i

31is a view similartojFig. 36, with .the

parts in a different positionpf operation;

Figs. "32 to'36, inclusive, are sectional views, illustrating the sequence of operations upon :the nutstock and the assembling of the washers with the partially formed'nuts;

Fig. .37 isa fragmentary .view in vertical .sec- "tion,"takensubstantially along .theline 31-337 .of

Fig. 32; V

Fig. 38 is a fragmentary view'.in vertic.al section, taken substantially along theline 38-48 "of Fig. 33;

Fig. .39 is a" fragmentary view in perspective of the mechanism-shown in 'Fig.'34 I Fig. 40 is a "fragmentary view'in, vertical section, taken substantially along the line 40-40 ofFig. 35;

'Fig. 41 is an enlarged sectional 'view, showing a washer assembled :With ;a "nut blank;

' -Fig. 42-is a fragmentary-"view in vertical -:section of a modified-form of washer feed control mechanism;

Fig. 43 is -a-viewinyertical section; taken along the line 4343 of Fig. 4-2;

Fig. 44' is-a view similar toFig. 42, showing an- "other modifiedform of washer feed control mechanism;

Fig. 45 1s a view in vertical section, taken along the line 45-45 of Fig. 44;

Fig. 46 is a view in horizontal section, taken along the line 46-46 ofFig. -'44; and "Fig. 47 is a .view in perspective -of 'washer :slides of the mechanism of Figs. 44 to 46. V

as shownin the drawings, a machine which forms one embodiment of the present invention comprises an automatic screw machine i2, of

standard type, such as-a Davenport '5 Spindle 'Automatic'Screw Machine, manufactured by the Davenport -Machine Tool Company, Inc., of Rochester, New York, ,for which are provided a plurality of additional mechanisms or attachments, by which said machine may be adapted for the production of a permanently assembled nut and washer unit as a new article of commerce. These additional mechanisms or attachments comprise a reel 3 for receiving a rolled =or woundstrip 4 of washers; awasherfeed mechpanismzt; *was'her severinglmechanism .8; an assembly mechanism Ill; and drive means I2 for .the Washer feed mechanism 6, Washer severing mechanism 8 and assembly mechanism It). The washer severing means 8, the assembling mechanism Illandthe drive means I2 are constructed to replace one of the spindles of the five-tool spindles .of theautomatic screw machine. Special tools are-provided for, and to cooperate with, the other fourspindles of the automatic screw 'machine to perform a selective sequence of operations upon bar or rod stock to provide at one end of each stock bar or rod a partially formed nut ornut blank fashioned toreceive a washer 1, specifically, ,a. continuous rin .toothedijlock washer, at the assembly station. At .the assembly .station the assembly" mechanism telescopes a Washer. with a partially formednut blank, .and enlarged, .swages, .or .extrudes material 'of .the .nut, .p.ermanently .tol hold the washer on the par,- -tially formed "nut blank. The permanently assembled nut blank and washer; pass .fromitheassemblymechanism tQanQther of the work spindle stations at which special vtools, .on. or cooperating withthespindle, savers the partially formednut blank .from the stock par orrod', threads or taps the nutblank.to-f0rm1the complete nut 9, and feeds ,or conveys the completed nut .and washer units 1 1(Eig.l?.'6) from.themachine.

The automatic .screw .machine '2. comprises a frame 14, mounted upon ,a. suitable platf.orm or stand It, a revolving head "I8, Fig'flLhaving five rotatable stock clamping and releasing chucksZflg, .to which stock rods or bars 22, preferably hexagonal in cross-section,Fi gs; 1 and '4, are supplied by a standard bar .feed mecha- ..nism .(not shown) operatedbya stockfeed'lever "indexedand locked in'indexed position-by the indexing lever-4-2, operated by the indexing cam 44.

The opening of the stock chucks 20, intimed relationto the advancement 'ofthe bar feed mechanism,-is controlled by the usual chuck operating mechanism (not shown) operated by th chuck control lever 46.

As shown in Fig. 11, the intermittently revolvable head [8 carries the stock in: succession from an initial work station 1,through work stations 2,3, '4 and 5. At stations 1, 2,3 'and'5; nut form'- ing operations 'are performed upon the stock bars or rods 22 by special tools carried by rectilinearly reciprocable spindles 48, :50 and 52 and the nut tapping mechanism 54 ofthe 5-sp'indle automatic screwmachine (see Figs 5 and 6). The spindles-and nut tapping mechanismare carried by the usual stationary, 'U-shape, 'frame mem'ber or '5 support 56, supported on the machine frame I4 in such manner that the spindles and nut tapping mechanism are aligned with the stock chucks 20 at'stations 1, 2, 3 and 5. The fifth spindle of the automatic screw machine is replaced on the frame 56 by the assembly mechanism In and the drive means I2, hereinafter to be described.

' At stations 1, 2, 3 and the stock'rods or bars are also operated upon by transversely shiftable side cutting tools 58, 60, 62 and 64, Fig. 11, the side cutting tools 58 and 60 being mounted upon slide blocks 66 and 68, supported on the frame I4 and the I side cutting tools 62 and 64 being mounted on levers I0 and I2 pivoted at their upper ends on rods I4 and I6 carried by appropriate supporting means mounted on the frame I4. The side cutting tools 58 to 64, inclusive, are actuated in timed relation to the revolution of the head I8 by suitable cams I8, 80, 82 and'84.

through bell cranks 86, 88, 90 and 92 and adjustable links 94, 86, 98 and I80. The cams I8 and 84 are mounted on front and rear cam shafts I02, I04, journaled in suitable brackets (not shown), supported by the machine frame I4. Bell crank levers 86 to 92 are pivoted on front and rear rods I06 and I08 carried by suitable brackets (not shown) secured to the frame I4.

The'side cutting tools are moved inwardly or toward the stock bars or rods by the cams I8 to 84, inclusive, and are retracted by spring means (not shown) which serve also to maintain the cam follower rollers, carried by the bell cranks 86 to 92, in engagement with the actuating earns The tool spindles 48 to 54 and the drive means I2 are advanced or moved toward the stock bars standing arm 6. posite direction by means of an actuating bar I10 carried by the mounting lever "I2 for the side cutting tool 62, the bar I10 engaging a set screw I12 carried by the bar I60.i When the bar I10 movin inwardly engages the set screw I12, the boring or chamfering tool I64 is moved in a counterclockwise direction, as seen in Fig. 39, to position the tool I64 in an offset relation with respect to the common axis of the spindle and stock so that the tool cuts or forms an internal chamfer on the nut blank. 5

At station 4 the usual spindle is replaced by the assembly mechanism I0 and the drive means I2, which will now be described.

Assembly mechanism The assembly mechanism I0 (Figs. 1, 6, 9, and 13 to 15) comprises a cylinder or sleeve I'II having a reduced forwardly'projecting tubular. portion or hollow plunger I I3. The reducedportion I12 provides the sleeve with an annular shoulder I14. The cylinder or sleeve I1I is slidably mounted in the bore I16 of a housing or mounting block I18 fastened in any suitable manner to, and projecting forwardly from, the forward up- IBO of the U-shaped spindle mounting frame 58. A plunger I82 having a reduced rear end portion I84 is slidably mounted in the sleeve or cylinder I10 and is provided with a tapered bore at its forward end to receive the tapered end I86 of a nut swaging, extruding or enlarging tool or plunger I88. The tool I88 projects from the plunger I82, by which it is carried, through the hollow plunger or reduced portion I'I2 of the cylinder or sleeve Ill. The toolor plunger I88 is formed at its forward end, as best or rods by cams H0, H2, H4, H8 and H8, re-

spectively, Fig. 4. These cams are mounted upon a common transverse shaft I20, journaled in side bearings I22 and I24 mounted upon the frame I4.

The cams H0 to H8, inclusive, operate the tool spindles 48to 54 and the drive means I2 through bell cranks I26, I28, I38, I32 and I34, respectively,

Figs. 4 and 6, and adjustable links, such as I36, I38 and I40, Fig. 6. The tool spindles are retracted by springs such as the spring I42, Fig.6, secured at one end to a pin I44, carried by each bell crank, and at the other end to the frame of the machine, as illustrated in Fig. 1. The bell cranks I I0 to I I8 are pivoted on pins, such as the pin I48, Fig. 6, carried by a bracket or brackets I 50,'Fig. 4, secured to the machine frame I4.

' The tool spindle 48, which is aligned with the,

stock at the initial-or stock feed-in station 1, carries a countersinking tool or center punch I52, Figs.,6 and 32.

Spindle aligned with each stock rod or bar at station 2 carries a drill I54 (Fig. 33) and an end surfacing, skirt dressing, cutting tool I56.

Spindle 52, aligned with each stock bar or rod at station 3, has pinned to it a depending bracket I 58, Figs. 34 and 39. A tool-carrying bar or lever I60 is pivoted at its lower end to bracket I58 (Fig. 34) as by a pin I62 (Fig. 39). The bar I60 .car-

' ries a chamferin g or boring tool I64 which proshown in Fig. 35, with a short, sharply tapered or beveled, nut swaging, extruding or enlarging portion I90 of relatively short axial extent and a substantially longer, slightly tapered centering prong or portion I92.

The cylinder III and plunger I82 are urged relatively in opposite directions by a coil spring I94 (Figs. 13 and 14) interposed between the shoulder formed on the plunger I82, by its rear, reduced portion I84, and a flanged cap I96 secured to the rear end of the sleeve I II as by a pin I58 and bearing'upon the tool-receiving bar I68 so as to urge the bar in a counterclockwise direction, as seen in Fig. 39, against stop means I68, in which position the chamfering or boring tool I64 is aligned with the axis of the spindle 52 and the axis of the stock rod or bar 22.

The tool-receiving bar [60 is moved in the op- I98 received in a bayonet slot 200 in the rim of the sleeve.

The washer feeding means .Washer feeding means 6 (Figs. 1, 6, and 16 to 20) comprises a Wheel 202 (Figs. 16. to 18) forming a positioningabutment for a plurality of radial, feeding pins or prongs 204 pressed in, but removable from, radial openings in an annular or ring flange 206 of a feed disk or drum 208 keyed or otherwise secured for rotation to wheel 202.

The wheel 202 is secured to and formed integrally with a stub shaft 2 I0 which projects through the hub 2 I2 of a disk or drum 208, the hub 2I2 serving as a bearing or journal, for mounting the drum 208 and the wheel 202 in the vertical flange of amounting block or bracket 2 I4 secured in any convenient manner to'the ma- 7 chine frame I4 above the revolving head I8 at Work station 4 (see Fig. 11). The stub shaft 2I0 has secured to its outer end a ratchet wheel 2I6 the upper end of the lever 2I 8 and is formedin its under surface with a pawl, tooth or dog: 222" formed to engage the teeth of the ratchet and rotate the ratchet on swinging of the lever 2I8 in a counter-clockwise direction, as seen in Figs.

l9 and 20, and to pass idly overthe ratchet when the-pawl lever is rotatedin the opposite direction. A pawl controlspring 224 is secure'dat-one end to the lower end of the pawl lever 22!] and at the other end to a pawl operating lever 2 [8 at a point'below the stub shaft 220 so as normally to urge the pawl 222 into engagement with the ratchet wheel 216. A bell crank 226, pivoted on the bracket 2M, is formed with a looking or indexing pawl, tooth or dog 228 shaped to engage the teeth of the ratchet and prevent reverse rotation thereof while permitting a counter-clockwise rotation of the ratchet. The pawl 228 is urged to ratchet engaging position by a "spring 230 secured at one end to the bell crank 226 and at the other end to a bracket 232 fastened to the forward wall of the bracket 2 l4.

'The feeding movement of the ratchet is controlled and adjusted by a feed control bar 234 'slidably mounted in a slot or recess 236 in the side surface of the bracket 2H3. The bar 234 carries apawl guiding and controlling pin 23S projecting laterally of the slide bar beneath the pawl 22a. The pm 228 guides and supports the tail of the pawl 220 and, according to its position of vertical adjustment according to the size of the washer being fed, determines the degree of arcuate movement of the ratchet as the pawl is swung in a counterclockwise direction by the pawl lever 2 H3.

The slide bar 234 also serves to control the connection and disconnection of the pawl and ratchet. For this purpose the bar is formed with an upwardly extending plunger portion 249 received in the bore 242 of a block 244 bolted to the top of bracket 2M. The plunger portion 242 projects above the block 242 and is externally threaded to receive'a'threaded sleeve 246 to which is'secured an operating knob 248. The raising of the knob 248 causes a lifting of pin 238 and the pin thereby raises the pawlor tooth 222 out of engagement with the ratchet 216. The pin 238 is held in raised position, and the pawl consequently-out of engagement with the ratchet, by a latching lever 250 pivoted to the top of the block 24 as by a bolt 252, the lever being norrrially urged to latching position under thesleeve 246' by a spring 255 secured at one end to a pin 256.

carried by the lever and at the other end to a pin 258 secured to a block 2611 projecting above the bracket 2 l4;

'The, paw1 operating lever 2 i8 is actuated by a plunger rod 252 slidably mounted in an opening in the upstanding arm or portion I80 of the spindle mounting frame 56. The rod carries at itsrforward end a block 264 provided with 'arecess or slot'266 receiving a pin 268 carried at the lower end of the pawl operating lever 2 l 8.;

The washer strip 2 passes from'the supply reel to the washer feeding means over a longitudinally curved guiding and supporting strip or strap 2'70 terminating just above the block 244, as seen in Fig. 16, the strap 2'") being supported at its forward end in a washer strip guide 212, Fig. 7, bolted to an angle bracket 275 (see Fig. 1) mounted-at its'forward end on that portion of the frame which houses-the revolving head [8. The supporting and guiding strap 210 is also supported intermediately by a generally H -shaped strip guiding channel 216, Figs. 1 and 8, resting on the upperend of a rod or tube 278 carried by the spindle operating bell crank I34, the rod 218' cons'tituting the usual means for manually operating thebell crank I34. It will be evident'that any convenient'means may be employed to support the guide: channel 216, the rod 278 being selected washer strip guide 272 is preferably formed witha flange 280' extending above the longitudinal guide strap 2763, as seen in Fig. '7, to serve asa lateral guide for. the washer strip. Itjwill be evi dent that guide 272 may be formed with a flange at its outer end complementary to the flange 230 to form a guiding wall for the other edge of the washer strip. I

From the forward guide 272 washer strip '4 passes over the forward, downwardly curved end of the guide strip 270 and to the feed wheel 202 over a guide 282 formed by the forward surface of the plate 269. The guide 262 is in theform of a track or channel having side flangesas shown in Fig. 18, spaced apart slightly greater than the width of the washer strip 4 so as laterally to conline the strip as it-passes to the feed wheel. The washer openings of the strip receive the tapered ends of the radial feed pins of the feed wheel, which tapered ends project beyond the periphery of the annular flange 286' of the drum 228.1

'The guide surface or track 282 extends first tangentially of the feed wheel and then arcuately concentric to the feed wheel and then in a vertical downward direction tangential to the feed wheel or to the periphery of the annular flange 295 of the drum. The feed pins pass through the washer openings of the strip and are received in 'a' central longitudinalslot 28%, Figs. 16 and 18, in

the guide surface of the plate 256. The plate 269 and a cover plate 285 are secured to the upstandingfiange of the bracket 254 by a pluraliity of bolts 288, the plate 285 being substantially L- shaped in cross section, as seen in Fig. 18, to house the guide plate Zfiil. Cover plate 2.86 is provided with a circular opening receiving the annular flange 296 of the drum 208 and the feed wheel 292 housed within the drum, this opening permitting ready assembly of the parts and inspection of the operation of the feed wheel;

Washer severing mechanism The washer severing mechanism 8 (Figs. :1, 6, 9, 13, 14, 15, 21 to 23, and 26 to 29) comprises a pair of mounting blocks 292 and 292, of which the block 29-2 is preferably formed integrally with and at the forward end of the sleeve I78, the block 295) being secured by. suitable positioning.

a washer strip-holder and'shear'block 3 H; pinned v and bolted to the blocks 290 and'2fi2' and having T a reduced lower portion received inthe bore 322. The shear block 3 I 8 is formed with a washer strip receiving slot 3! 2 passing from top to bottom thereof and adapted to be aligned with the washer slot 366 of the severing roll 3M. Edges of the slot M2 at the top of the blockare chipped or tapered as at 3| 4 to form a generally frusto-conical guide surface for the washer strip. as it passes into the severing means.

The blocks 290 and 292 are also'formed with 9. coaxial, aligned openings or bores 3I6 an'd 3I8 to'receive and guide the plunger I12 of the assembly means I0. The mating surfaces of the roller is vertically aligned with the slot 320. Slot 320 serves as a guide for depositing the washer in the aligned bores 3I6 and 3I8 in advance of the plungers I12 and I88 when said plungers are retracted, as shown in Fig. 14.

The washer is of course slightly smaller than the bores 316 and 3I8 and therefore a washer feed control mechanism is provided to hold the washer in an upright vertical position to be picked up by the plungers I12 and I88 when those plungers are advanced from the position of Fig. 14 to the position of Fig; 13. This washer feed control mechanism, in the form shown in Figs. 13, 14, and 26 -to 2 9, comprises a pair of rollers or pins 322 and 324 mounted in vertical slots 326 and 328 communicating on one sidewith the bore 3 I 6 and on the other side with transverse openings in which are mounted pins 330 and 332. The pins 330 and 332 are normally urged inwardly by spring strips 334 and 336 respectively bolted to the opposite sides of the block 292. The washer retaining pins or rollers 322 and 324 are normally urged by the springs 334 and 336 to the position shown in Figs. 26' and 28, in which position the rollers project into the opening 3I6 in advance of the plunger I12, the inward movement of the pins being limited by the inner sides of the slots 3'26 and 328 above and below opening 3 I6. The severing roller is oscillated or rotated by an actuating rack 338 guided in aligned slots in the blocks 290 and 292 and the sleeve I18 and held in position by a cover plate 340 bolted to the sides of the blocks 290 and 292 and the sleeve I18. The rack is carried by a plunger 342 which may be formed integral with the rack and projects rearwardly thereform through a suitable bore in the sleeve I18 as shown in Fig. 15. A coil spring 344 interposed between the rearward end of the sleeve I18 and a pair of nuts 346 on the threaded end portions 341 of the plunger, urges the plunger and the rack rearwardly or to a retracted position, as shown in Fig. 14.

Drive means for the washer feed mechanism, the v washer severing mechanism and the assembly mechanism The drive means I2, Figs. 1, 6, 9, 13, 14 and 15, comprises a spindle. which'consists of a plunger 348 and a sleeve 350, the sleeve being'secured to the plunger as by a pin 352 and the plunger being slotted at its rear end to receive the forward end of the adjustable link I40 to which it is pivoted as by pin 354. The plunger and sleeve are slidably mounted in the rear upstanding portion'356 of the frame 56 and are held against permit ready passage of the abutment bar 358 as the plunger 348 and sleeve 350 are reciprocated between the positions shownin Figs. 13 and 14. The side arm is also provided with an aperture 310' through which the threaded end 348 i v of the rod 342 projects. a

Reduced portion I84 of the plunger l82 projects into the forward end of the sleeve 3'50 and is secured to the sleeve as by a cross pin 312. The rearward movement of the rod 342 is adjustably determined by a set screw 314 threaded into the frame portion 356 and projecting forwardly therefrom to engage the end of the rod 342.

The abutment bar 358 adjustably determines the rearward limit of movement or position of I the sleeve I10, as shown in Fig. 14.

The nut tapping mechanism in the sleeve 316 and keyed thereto for rotation" therewith. The second sleeve has threaded inits outer or forward end a chuck sleeve 388. The

chuck sleeve 388 has a plurality of longitudinal slots therein forming resilient chuck jaws 390 which, by the resiliency of the slotted sections of the chuck sleeve, are normally urged outwardly to open position, as shown in Fig. 30. The chuck jaws. are formed with frusto-conical peripheral surfaces 392 which engage the inner frusto-tmnical surface 393at the forward end of the outer sleeve 316. A slide block 394 is mounted on the inner sleeve 386 by means of a ball bearing 396 fitted over that sleeve, beyond the rear end of the outer sleeve 316, and securedin position between anenlarged ring portion 398 of the inner sleeve and a bearing retainer ring 400' threaded on the sleeve 386. The sleeve 386 is provided with a plurality of, preferably three, longitudinal slots 402 in which are slidablymounted driving bars j or keys 404 having reduced forward end portions 406 received in the rear end of the outer sleeve A sleeve 408 having at its forward end an env larged head portion M0 is secured to the slightly reduced portion 4I2 of the inner sleeve 386'as by a set screw (not shown). The sleeve 408 carries a plurality of, preferably three, clutch levers 4 I 8 pivoted as by pins 4] 8 in slots of the head 4I0 of the sleeve408, the clutch levers 4I6 having longitudinal clutch pin portions 420 bearing at their forward end on the rear ends of the driving bars or keys 404 and havingat their opposite ends beveled cam surfaces'422. The clutch col-' lar 424 is slidably mounted on the barrel of the sleeve 408 and has at its forward end-a frustoconical camming surface 426' adapted to engage the beveled or cammed surfaces 422 of the clutch pins 420 so as to cause the clutch levers to swing inwardly from the position of Fig. 30 to the position' of Fig. 31 when the forwardmovement of the inner sleeve has been arrested and thereby move the outer sleeve 316 forwardly of the inner, sleeve. Sleeve 408 is provided with slots 428 com- 1 plementary to the slots 402 in the sleeve 386 and aligned therewith to permit the inner and outer swinging movement of the clutch levers .4I6. Internally threaded collars or nuts 430 threaded on the reduced end portion 432 of the sleeve 386 ,retain the partsin assembled relation. A nut" housing and feed tube 434 extends through the;

inner sleeve 386 and is secured thereto as by an externally threaded enlarged portion 436 mating with the internally threaded end portion 432 of. the sleeve 386. Nut-like portion 438 on the outer end of the tube 434 provides ready means for removing the nut housing or feed tube from.

the inner sleeve. 7

The slide block 394 is held against rotationand guided by a stationary bar or key 440 bolted to the inner face of a mounting bar or block 442 secured as by bolts.444,Figs. 9. and 10, to. theupstanding portions l80ancl 356 of the frame 56.

The bar 440 also forms a guide for a slide 446, of U-shaped cross section having a, lateral, arm 448 received in an annular slot 450 in the. clutch control ring or sleeve 424.

The slide. block 394 moves. between adjustable.

limit stops comprising bar 452' and 454 "adjustably secured in any convenient manner to a bar or plate. 456 bolted to the upper surface. of the mounting bar 442 so that the stop bars are above.

the path of movement of the slide 446 but. in the.

pathof movement of the slide. block 394'.

The Slide 446 is. actuated by an. adjustable link 458 pivoted at its forwardend to lugs 460 depend ing from the slide and pivoted at the other end to the lever I26 (see Fig. 4).

cam I"l which for that purpose is formed with an internal cam groove in. which the. cam follower roller at the lower end of the. lever is. re.- ceived (Fig. 12A).

A threading tap .462- (Figs. 30, 31, 36) is formed atthe forward end or a stationary nut feeding rod 464' which passes through the nut hOuslng an'd'feeding tube 434 and extends rearwardly be.- yond the end thereof, the rear end of .therod being curved and received in a stationary. block 466, Figs. 9 and 10,. bolted to the mounting bar 442'. The block466 is provided with afcurved slot 468. of a size to receive nut and washer units topermit their ready passage along. the slot from the forward'end thereof to the rear. end. A cover plate410 is bolted to the surface .of. the plate 466 and extends over the curved slot 468. Th'einterfitting, of theend of'the.rod.4'64 in the curved.

slot 468 and the positioning of the cover plate over the slot prevent the nut. feeding rod .and. the threading tap 462 from rotating. with the. chuck jaws 390 and the nut housing. tube 434 Th'enut. feeding rod 464' extends beyond the .block'466.

and terminates, over a funnel 472' into-which. the assembled nutandwasher units fall and arefde livered to a'suitable container. I v

,'A set screw 414"carri'ed by the lateral. arm 448 of the slide 4461s positioned to engage theblock 3 94 thereby adjustably to determine the ap-- proaching movement of the collar 424'relative to the block 394.

The driving mechanism of the. automatic screw machine.

order to understand the timed relation and sequence of operations performed upon the nut;

stock and the assembling'ofwashers, with the nut stock during theprocess of forming of the.

nuts, thedrive'mechanism 416 for the automatic screw machine and the additional mechanisms or attachments by which the machine .isQconverted into a machine for manufacturing permav nently assembled nut and washer units is diagrammatically illustrated in Figs. 12 to 12 E.

'This drive mechanism 416 comprises a drive.

motor 418 mounted in any, suitable manner upon The. lever 126 is. actuated positively inopposite directions. by the.

12 themachine frame-as illustrated in 1. The. motor 418 drives a countershaft 480 asby means of sprockets 482 and 484 and sprocket chain 486. countershaft 480 through a gear reducing mechanism, represented by the intermeshing chain; of.

gears 488, 490 and 492, drives the intermeshing, gears 494 of the stock chucks 20. A gear 496 on the shaft 382 meshes with all. of the like. gears.

494 and thereby assures continuous rotation of the shaft 382 in synchronism with the stock chucks 20. The shaft 382 continually rotates the nut tapping mechanism 54 through thegear 318 previously described. 5 I

The countershaft 480 also drives, through-a1 gear reducing mechanism. indicated by the'gears.

498 and 500, the driving member. ofv a manually,

controlled clutch 582 of which the driven member is secured to a drive shaft 504 extending longi tudinally of the machine. at the rear side thereof. The shaft 504 through gears 508 and 508'drives. a cross shaft 510 having a gear 5H and driving; clutch. member 512 secured thereo.. The driving;

clutch member 5I2' cooperates with a driven clutch member including agear 5l4 on a sleeve.

the. rim of a gear. 523' meshing With-a gear 524-; The. gear. 524- has a; pinion portion 525. (Fig. 12) meshing with the gear M4. The clutch control lever52l is latched-.

on a stud-shaft. (Fig.

in clutch disengaging position by a latchlever. 528 released from alatch'pin529 on the lever 521 by a cam 539. The. gear 523 is secured tor-and drives the crankshaft 525 which;carries the in-- dexing cam 44 'by' means. of which the indexing:v lever 42, Fig. 1, is acuated'. The shaft. 526. also 1 carries the crank 40 to -whichis pivoted the lever.

38, Fi 1, by which the grab mechanism for. in:

termittently revolving the head I8 isactuated. Barrel cam 534 is secured to the forward end section of the shaft 526 and is engaged by-cam'. rollers on the lower ends of the stock feed lever. 24. and the chuck control lever'46 so as to operate" the bar feed mechanism (not shown) in proper timed relation with the intermittent revolution of the stockhead [8. to advance. the. stocktoward the spindles at station'No. 1.

A hand wheel 535 v on the outer end of shaft 510 provides means for manually turning shaft- 5J0 to set the tool.- spindles, as. will hereinafter.

appear.

The gear 5| I meshes with a gear 53 6. on across. shaft 538 having at its right hand end a-gear.

540 of a chain speed gear mechanism 542, final...

gear 5440f which issecured to the. end of a cross shaft 546 carrying. Worm gears 548 and 550 driving worm wheels 552-and 554. The worm wheels; 552 and 554 are mountedonwcomplementary Ion.- gitudinal cam shafts 556 and 558' at-the. front and.

rear of the machine, theseshafts carrying; the: cams 18, 80, 82 and 84 by means of which. the;

side. cutting tools 58, 60,. 62 and 64 are moved in and out in timed relation. to the intermittent revolution of the. stock head l8. Cam shaft 558 also carries the. latch control cam 530 which as:- sures the re-connection of. the crank. shaft 526 totheshaft5l6 on each complete rotation of the; 

